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Former CIA chief and general David Petraeus (L) and Germany Federal Minister of Defence Ursula von der Leyen (R) attend the plenary session at the 14th Asia Security Summit, the International Institute for Strategic Studies (IISS) Shangri-La Dialogue 2015 in Singapore on May 30, 2015. The United States on May 30 called for an "immediate and lasting halt" to reclamation works in disputed waters in the South China Sea, saying Beijing's behaviour in the area was "out of step" with international norms. AFP PHOTO / ROSLAN RAHMANROSLAN RAHMAN/AFP/Getty Images